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I have an AWS configuration comprising of 1 ELB (Load Balancer) and 2 EC2 instances (Web Servers). The 2 EC2 instances currently have an IP (EIP) associated with each. Do I actually need these IP address if the web servers are behind an ELB? How about for SSH connections (Putty etc) do I need the IP address for this? I am just interested as I can see benefits in dropping the IP addresses – would allow easier horizontal scaling etc.
Actually, you don’t need Elastic IP Addresses for your instances. I suggest you to configure Auto Scaling for your application for durability, stability and faster response time.
The number of Instances will be dynamic, depending on CPU Utilization. This is how you do it: Auto scaling your website with Amazon Web Services (AWS) – Part 2
As for SSHing your instances, you have to figure out Public DNS of your Instances first, but it’s easy to accomplish it with EC2 API Tools or AWS Console.